import java.io.*;
import java.util.*;

public class Solution 
{

    public static void main(String[] args) 
    {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String d = in.next();
        char[] charArray = new char[n];
        charArray = d.toCharArray();
        int[] intArray = new int[n];
        
        for(int i = 0; i < n; i++)
        {
            if(charArray[i] == 'U')
                intArray[i] = 1;
            else
                intArray[i] = -1;
        }
        
        int level = 0;
        int finalCount = 0;
        for(int c = 0; c < n; c++)
        {
            if(level == 0)
            {
                if(intArray[c] == -1)
                    finalCount++;
            }
            
            level += intArray[c];
        }
        
        System.out.print(finalCount);
    }
}